Corrosion Proof Hastelloy C22 Seamless Pipe for Flue Gas Incinerator

In modern waste-to-energy boilers, municipal solid waste incinerators, and toxic waste thermal treatment units, piping systems face simultaneous exposure to high-temperature oxidizing atmospheres, acidic condensates, wet chlorine gas, and molten ash slag. Standard stainless steels and conventional alloys suffer rapid localized wall thinning and stress cracking. Our OD 38mm Hastelloy C22 seamless pipe addresses these extreme operating demands with its optimized nickel-chromium-molybdenum-tungsten matrix, providing superior chemical stability and thermal fatigue endurance.

Manufactured via multi-pass precision cold drawing and continuous solution annealing, every Hastelloy C22 seamless pipe exhibits an isotropic microstructure, uniform grain boundary distribution, and ultra-smooth inner surfaces. Tight outer diameter and wall thickness tolerances minimize fluid friction, prevent ash slag accumulation, and provide exceptional structural reliability during thermal expansion cycles.

With a high chromium content of over 20%, the alloy forms a dense, self-healing oxide passivation layer that withstands continuous high-temperature oxidizing flue gases, toxic acid vapors, and volatile halide compounds in waste incinerators up to elevated operational thresholds.

The robust combination of 13.5% nominal molybdenum and 3.0% tungsten provides an exceptionally high Pitting Resistance Equivalent Number (PREN), completely suppressing localized pitting attack and crevice breakdown in stagnant chloride-rich condensates and wet scrubber ducts.

Unlike standard nickel alloys, Hastelloy C22 resists severe oxidizing aqueous media containing wet chlorine gas, hypochlorite mixtures, ferric chlorides, and nitric-hydrofluoric acid blends generated during industrial and hazardous waste combustion.

Engineered with ultra-low carbon (C ≤ 0.015%) and silicon contents, this seamless pipe eliminates grain-boundary carbide and intermetallic precipitation during high-heat welding, ensuring maximum corrosion resistance in heat-affected zones (HAZ).

The cold-drawn seamless manufacturing route guarantees uniform wall thickness, zero weld seam weak points, and outstanding high-pressure containment capability under severe hydraulic shock and thermal cycling.

Serves as superheater tubes, evaporator banks, and economizer bundles directly exposed to chlorinated hot flue gases and corrosive molten salt deposits.

Applied in acid gas injection lines, reactor feed nozzles, and quench chamber cooling coils handling aggressive organic and inorganic acidic effluents.

Utilized in spray header piping, mist eliminator support tubes, and re-heater exchangers processing wet sulfurous and hydrochloric acid mists.

Employed in corrosive chlorination reactors, acetic acid synthesis columns, and bleach processing heat exchangers operating under high pressure and temperature.

DLX controls the entire production chain from vacuum induction melting (VIM) and electroslag remelting (ESR) to hot extrusion and precision multi-pass cold rolling, ensuring ultra-pure alloy chemistry and repeatable batch consistency.

Operating modern automated production lines with an aggregate manufacturing capacity of 1,200 tons per month, DLX guarantees continuous material availability, stable supply schedules, and rapid project turnaround for global EPC contractors and plant operators.

DLX offers flexible minimum order quantities tailored to specific pipe diameters, wall gauges, and project stages, providing rapid sample spools for pilot tests and continuous container-load delivery for plant retrofits.

Every production lot undergoes full-process testing, including 100% Positive Material Identification (PMI), hydrostatic pressure testing, eddy current / ultrasonic internal flaw detection, and mechanical tensile property verification prior to export.

While both are premier Ni-Cr-Mo alloys, Hastelloy C22 features approximately 22% chromium compared to 16% in C276. In waste incineration facilities where oxidizing gases, hot oxygen streams, and nitric acid mixtures are prevalent, C22 delivers substantially higher resistance to general oxidation and intergranular attack.

Yes. We manufacture OD 38mm seamless pipes across standard schedule gauges and customized thick/thin wall specifications, with fixed straight lengths up to 12 meters tailored to specific boiler and heat exchanger drawings.

Each shipment is supplied with a comprehensive Material Test Certificate (MTC) detailing spectroscopic chemical analysis, mechanical tensile and elongation properties, hardness results, hydrostatic test records, and non-destructive examination (NDE) reports.

All seamless pipes are cleaned, capped with protective plastic end plugs, wrapped in waterproof vapor-barrier film, and packed into reinforced fumigated wooden crates with internal timber dividers to eliminate transit vibration and surface scratching.